<?php
/*
文件下载类
lsj 2009-5-4
*/

class lib_class_down
{
	protected $debug = false;
	protected $errormsg = '';
	protected $filter = array();
	protected $filename = '';
	protected $mineType = 'text/plain';
	protected $xlq_filetype = array();

	function __construct($fileFilter = '', $isdebug = true)
	{
		$this->set_filter($fileFilter);
		$this->set_debug($isdebug);
		$this->set_fileType();
	}

	function set_filter($fileFilter)
	{
		if(empty($fileFilter)) return ;
		$this->filter = explode(',',strtolower($fileFilter));
	}

	function set_debug($debug)
	{
		$this->debug = $debug;
	}

	function set_fileName($filename)
	{
		$this->filename=$filename;
	}

	function download($filename)
	{
		$this->setfilename($filename);
		if($this->file_check()){
			$fn = array_pop( explode( '/', strtr( $this->filename, '\\', '/' ) ) );
			header( "Pragma: public" );
			header( "Expires: 0" );
			header( "Cache-Component: must-revalidate, post-check=0, pre-check=0" );
			header( "Content-type:".$this->mineType );
			header( "Content-Length: " . filesize( $this->filename ) );
			header( "Content-Disposition: attachment; filename=\"$fn\"" );
			header( 'Content-Transfer-Encoding: binary' );
			readfile( $this->filename );
			return true;
		}else {
			return false;
		}
	}

	function get_errorMsg()
	{
		return $this->errormsg;
	}

	function file_check()
	{
		$filename = $this->filename;
		if(file_exists($filename)) {
			$filetype = strtolower(array_pop(explode('.',$filename)));
			if(in_array($filetype,$this->filter)) {
				$this->errormsg .= $filename.'不允许下载！';
				if($this->debug) exit($filename.'不允许下载！') ;
				return false;
			}else{
				if(function_exists( "mime_content_type" )) {
					$this->mineType = mime_content_type( $filename );
				}
				if(empty($this->mineType)){
					if( isset($this->xlq_filetype[$filetype])) $this->mineType = $this->xlq_filetype[$filetype];
				}
				if(!empty($this->mineType)) return true;
				else {
					$this->errormsg .= '获取'.$filename.'文件类型时候发生错误，或者不存在预定文件类型内';
					if($this->debug) exit('获取文件类型出错');
					return false;
				}
			}
		}else{
			$this->errormsg.=$filename.'不存在!';
			if($this->debug) exit($filename.'不存在!');
			return false;
		}
	}

	function set_fileType()
	{
		$this->xlq_filetype['chm']='application/octet-stream';
		$this->xlq_filetype['ppt']='application/vnd.ms-powerpoint';
		$this->xlq_filetype['xls']='application/vnd.ms-excel';
		$this->xlq_filetype['doc']='application/msword';
		$this->xlq_filetype['exe']='application/octet-stream';
		$this->xlq_filetype['rar']='application/octet-stream';
		$this->xlq_filetype['js']="javascript/js";
		$this->xlq_filetype['css']="text/css";
		$this->xlq_filetype['hqx']="application/mac-binhex40";
		$this->xlq_filetype['bin']="application/octet-stream";
		$this->xlq_filetype['oda']="application/oda";
		$this->xlq_filetype['pdf']="application/pdf";
		$this->xlq_filetype['ai']="application/postsrcipt";
		$this->xlq_filetype['eps']="application/postsrcipt";
		$this->xlq_filetype['es']="application/postsrcipt";
		$this->xlq_filetype['rtf']="application/rtf";
		$this->xlq_filetype['mif']="application/x-mif";
		$this->xlq_filetype['csh']="application/x-csh";
		$this->xlq_filetype['dvi']="application/x-dvi";
		$this->xlq_filetype['hdf']="application/x-hdf";
		$this->xlq_filetype['nc']="application/x-netcdf";
		$this->xlq_filetype['cdf']="application/x-netcdf";
		$this->xlq_filetype['latex']="application/x-latex";
		$this->xlq_filetype['ts']="application/x-troll-ts";
		$this->xlq_filetype['src']="application/x-wais-source";
		$this->xlq_filetype['zip']="application/zip";
		$this->xlq_filetype['bcpio']="application/x-bcpio";
		$this->xlq_filetype['cpio']="application/x-cpio";
		$this->xlq_filetype['gtar']="application/x-gtar";
		$this->xlq_filetype['shar']="application/x-shar";
		$this->xlq_filetype['sv4cpio']="application/x-sv4cpio";
		$this->xlq_filetype['sv4crc']="application/x-sv4crc";
		$this->xlq_filetype['tar']="application/x-tar";
		$this->xlq_filetype['ustar']="application/x-ustar";
		$this->xlq_filetype['man']="application/x-troff-man";
		$this->xlq_filetype['sh']="application/x-sh";
		$this->xlq_filetype['tcl']="application/x-tcl";
		$this->xlq_filetype['tex']="application/x-tex";
		$this->xlq_filetype['texi']="application/x-texinfo";
		$this->xlq_filetype['texinfo']="application/x-texinfo";
		$this->xlq_filetype['t']="application/x-troff";
		$this->xlq_filetype['tr']="application/x-troff";
		$this->xlq_filetype['roff']="application/x-troff";
		$this->xlq_filetype['shar']="application/x-shar";
		$this->xlq_filetype['me']="application/x-troll-me";
		$this->xlq_filetype['ts']="application/x-troll-ts";
		$this->xlq_filetype['gif']="image/gif";
		$this->xlq_filetype['jpeg']="image/pjpeg";
		$this->xlq_filetype['jpg']="image/pjpeg";
		$this->xlq_filetype['jpe']="image/pjpeg";
		$this->xlq_filetype['ras']="image/x-cmu-raster";
		$this->xlq_filetype['pbm']="image/x-portable-bitmap";
		$this->xlq_filetype['ppm']="image/x-portable-pixmap";
		$this->xlq_filetype['xbm']="image/x-xbitmap";
		$this->xlq_filetype['xwd']="image/x-xwindowdump";
		$this->xlq_filetype['ief']="image/ief";
		$this->xlq_filetype['tif']="image/tiff";
		$this->xlq_filetype['tiff']="image/tiff";
		$this->xlq_filetype['pnm']="image/x-portable-anymap";
		$this->xlq_filetype['pgm']="image/x-portable-graymap";
		$this->xlq_filetype['rgb']="image/x-rgb";
		$this->xlq_filetype['xpm']="image/x-xpixmap";
		$this->xlq_filetype['txt']="text/plain";
		$this->xlq_filetype['c']="text/plain";
		$this->xlq_filetype['cc']="text/plain";
		$this->xlq_filetype['h']="text/plain";
		$this->xlq_filetype['html']="text/html";
		$this->xlq_filetype['htm']="text/html";
		$this->xlq_filetype['htl']="text/html";
		$this->xlq_filetype['rtx']="text/richtext";
		$this->xlq_filetype['etx']="text/x-setext";
		$this->xlq_filetype['tsv']="text/tab-separated-values";
		$this->xlq_filetype['mpeg']="video/mpeg";
		$this->xlq_filetype['mpg']="video/mpeg";
		$this->xlq_filetype['mpe']="video/mpeg";
		$this->xlq_filetype['avi']="video/x-msvideo";
		$this->xlq_filetype['qt']="video/quicktime";
		$this->xlq_filetype['mov']="video/quicktime";
		$this->xlq_filetype['moov']="video/quicktime";
		$this->xlq_filetype['movie']="video/x-sgi-movie";
		$this->xlq_filetype['au']="audio/basic";
		$this->xlq_filetype['snd']="audio/basic";
		$this->xlq_filetype['wav']="audio/x-wav";
		$this->xlq_filetype['aif']="audio/x-aiff";
		$this->xlq_filetype['aiff']="audio/x-aiff";
		$this->xlq_filetype['aifc']="audio/x-aiff";
		$this->xlq_filetype['swf']="application/x-shockwave-flash";
	}

}
?>